kpix 5 reporter anne makovec answers the question, are we ready to respond to a large- scale disaster? [ yelling ] >> reporter: in this scenario it's all pretend but after two major disasters in the u.s. this week, the bombing in boston and the plant explosion in texas, the possibility of a large-scale tragedy here is hitting home. >> what will we do? what will happen? >> reporter: those are the questions that brought hundreds of people to this training drill in san francisco today put on by the fire department's nert, or neighborhood emergency response team. >> the preparation that you do is really going to pay off no matter what the emergency is. >> reporter: in the bay area, we're vulnerable to earthquake, flooding, fire and terrorist attacks. >> absolutely first responders will be there but they will be overwhelmed by an event such as the one in boston. >> reporter: what we saw in boston was volunteers stepping in to help stopping bleeding and saving lives. >> it's kind of brought more seriousness to the volunteers approach. you know? maybe there's sort of a casual approach, yeah,